MGP WRM2 Spécifications Page 41

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TelePole WR/ Operating & Maintenance Manual Page 41
8.14. Detector failure (PC 2003)
The detector alarm is activated when:
- The detector high voltage power supply is defective.
- The detector is located in a background radiation field and the low range Geiger is
defective. If the detector is located in a radiation field higher than 800mR/h, and the
meter displays the following readings sequence: 800 mR/h, 600 mR/h, 0.00 mR/h -
this indicates high range Geiger malfunction.
Check (500÷550)V
on R4/R5
Check 5V on C2
No
Check (500÷550)V
on R4/R5
Check positive
pulses on ZP1201
G1 (Geiger pin)
O.K.
Detector failure
O.K.
O.K.
Yes
O.K.
No
No
Replace U3
END
END
No
Replace Q2 or Q4
Check TTL pulses
on U3/8
Check TTL pulses
on J1/4
Replace U1
Replace T1
No
Check and fix the
cable between
meter & detector
O.K.
O.K.
O.K.
O.K.
No
Replace Q3 & Q1
Check TTL pulses
on U3/1
Check (500÷550)V
on R4/R5
Check (500÷550)V
on R4/R5
Replace Card
No
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